That was still born. The claim was not enough interest to make it at the price point they were targeting. The largest scale currently available is 1/12 under license. This car would be about a meter long. The price was about $800 to $1200 range iirc.

It is listed as being at SDCC this year.
I'll try and get over to the Sideshow booth next week. I'm on the floor Tuesday before everything is open so it should be a good chance to see and talk to people about products.

Maybe they realized we were willing to pay 800 for a 1/50 scale Batcave that we’d pay through the nose on the 1/6 Batmobile too. I hope it really is coming out. I don’t care about more figures (unless they were Penguin and Joker) but I would love to have this Batmobile for my Batman and Robin.

Saving my sideshow points. I saw it on their website as SDCC release, but it looked like a summary of the past few years. https://www.sideshowtoy.com/whats-new/coming-soon/
it's in the right corner at the very bottom of the page.
It leads to no 1966 goodness, just a rehash of the Batman characters and their status. (or plural of status - stati? English majors respond please)

This is one of those cases where I hope it's released just for the sake of being able to say it exists, and for the people who could actually afford to buy one. But for me, it's a moot point, as I don't have a "spare" rent payment lying around